[Simple-support] Element/Attribute Default Values

[Keith B. <ka...@gm...>]

I have a situation where a field isn't required, but when it's null and is
serialized, the tag still needs to show up empty.  Specifically, there is a
String field (webAddress) that has an Attribute annotation, that went it's
null should be serialized to <webAddress/>, instead of not showing up.  Is
there a way to intercept the serializing of an Element/Attribute, and based
upon it's type, serialize a default value?